GHA main: Disable lit-test driver/config_diag.d for macOS arm64 job

.github/actions/4b-test-lit/action.yml

@@ -1,16 +1,23 @@
 name: Run LIT testsuite
 inputs:
   arch:
-    required: false # Windows only
+    required: false # Windows and macOS only
 runs:
   using: composite
   steps:
 
     - name: 'Posix: Run LIT testsuite'
       if: runner.os != 'Windows'
       shell: bash
-      # temporarily add LLVM bin dir to PATH, so that e.g. wasm-ld is found
-      run: cd ../build && PATH="$PWD/../llvm/bin:$PATH" ctest -V -R "lit-tests"
+      run: |
+        set -eux
+        # FIXME: crashes on M1 runners
+        if [[ '${{ runner.os }}-${{ inputs.arch }}' == macOS-arm64 ]]; then
+          rm tests/driver/config_diag.d
+        fi
+        cd ../build
+        # temporarily add LLVM bin dir to PATH, so that e.g. wasm-ld is found
+        PATH="$PWD/../llvm/bin:$PATH" ctest -V -R "lit-tests"
 
     - name: 'Windows: Run LIT testsuite'
       if: runner.os == 'Windows'